Chemistry - Study Mode

[#766] The pollutant responsible for ozone holes is ________
Correct Answer

(D) CFC

Explanation

Solution: Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.

[#767] Major gaseous pollutant of the thermal power station is
Correct Answer

(D) SO 2

Explanation

Solution: A flue-gas stack is a type of chimney, a vertical pipe, channel or similar structure through which combustion product gases called flue gases are exhausted to the outside air. Flue gases are produced when coal, oil, natural gas, wood or any other fuel is combusted in an industrial furnace, a power plant’s steam-generating boiler, or other large combustion device. Flue gas is usually composed of carbon dioxide (CO2) and water vapor as well as nitrogen and excess oxygen remaining from the intake combustion air. It also contains a small percentage of pollutants such as particulate matter, carbon monoxide, nitrogen oxides and sulfur oxides. The flue gas stacks are often quite tall, up to 400 metres (1300 feet) or more, so as to disperse the exhaust pollutants over a greater area and thereby reduce the concentration of the pollutants to the levels required by governmental environmental policy and environmental regulation.

[#768] The gas causing acid rain in an industrial area is
Correct Answer

(C) Sulphur dioxide

Explanation

Solution: Acid rain results when sulphur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents.

[#769] Entropy of Universe is always
Correct Answer

(D) Increasing

Explanation

Solution: The second law of thermodynamics can be stated in terms of entropy. In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing. There is a strong connection between probability and entropy.

[#770] In a reaction of the type A+B -> C+D one could ensure it to be a first order reaction by :
Correct Answer

(C) Increasing the concentration of a reactant

Explanation

Solution: In a reaction of the type A+B -> C+D one could ensure it to be a first order reaction by increasing the concentration of a reactant.